High LOD and a high anisotropic filtering work hand in hand and its almost pointless using a high lod with a low or default af setting.

Due to the way microsoft designed the texture loader it can be very slow catching when bring the textures in to focus and it can take a minute for them to catch up.

The highest lod you can use is 10 but here is an example of an 8.5 lod with a 30/40mi visibility setting, 16 AF and a x32 AA setting

http://images.ukcs.net/10412/2011-2-25_13-40-31-436.jpg

I dont use above 6.5 on the lod as there is no point i feel.